1 /* Definitions for POSIX memory map interface.  Linux/x86_64 version.
2    Copyright (C) 2001-2012 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <http://www.gnu.org/licenses/>.  */
18 
19 #ifndef _SYS_MMAN_H
20 # error "Never use <bits/mman.h> directly; include <sys/mman.h> instead."
21 #endif
22 
23 /* The following definitions basically come from the kernel headers.
24    But the kernel header is not namespace clean.  */
25 
26 
27 /* Protections are chosen from these bits, OR'd together.  The
28    implementation does not necessarily support PROT_EXEC or PROT_WRITE
29    without PROT_READ.  The only guarantees are that no writing will be
30    allowed without PROT_WRITE and no access will be allowed for PROT_NONE. */
31 
32 #define PROT_READ	0x1		/* Page can be read.  */
33 #define PROT_WRITE	0x2		/* Page can be written.  */
34 #define PROT_EXEC	0x4		/* Page can be executed.  */
35 #define PROT_NONE	0x0		/* Page can not be accessed.  */
36 #define PROT_GROWSDOWN	0x01000000	/* Extend change to start of
37 					   growsdown vma (mprotect only).  */
38 #define PROT_GROWSUP	0x02000000	/* Extend change to start of
39 					   growsup vma (mprotect only).  */
40 
41 /* Sharing types (must choose one and only one of these).  */
42 #define MAP_SHARED	0x01		/* Share changes.  */
43 #define MAP_PRIVATE	0x02		/* Changes are private.  */
44 #ifdef __USE_MISC
45 # define MAP_TYPE	0x0f		/* Mask for type of mapping.  */
46 #endif
47 
48 /* Other flags.  */
49 #define MAP_FIXED	0x10		/* Interpret addr exactly.  */
50 #ifdef __USE_MISC
51 # define MAP_FILE	0
52 # define MAP_ANONYMOUS	0x20		/* Don't use a file.  */
53 # define MAP_ANON	MAP_ANONYMOUS
54 # define MAP_32BIT	0x40		/* Only give out 32-bit addresses.  */
55 #endif
56 
57 /* These are Linux-specific.  */
58 #ifdef __USE_MISC
59 # define MAP_GROWSDOWN	0x00100		/* Stack-like segment.  */
60 # define MAP_DENYWRITE	0x00800		/* ETXTBSY */
61 # define MAP_EXECUTABLE	0x01000		/* Mark it as an executable.  */
62 # define MAP_LOCKED	0x02000		/* Lock the mapping.  */
63 # define MAP_NORESERVE	0x04000		/* Don't check for reservations.  */
64 # define MAP_POPULATE	0x08000		/* Populate (prefault) pagetables.  */
65 # define MAP_NONBLOCK	0x10000		/* Do not block on IO.  */
66 # define MAP_STACK	0x20000		/* Allocation is for a stack.  */
67 # define MAP_HUGETLB	0x40000		/* Create huge page mapping.  */
68 #endif
69 
70 /* Flags to `msync'.  */
71 #define MS_ASYNC	1		/* Sync memory asynchronously.  */
72 #define MS_SYNC		4		/* Synchronous memory sync.  */
73 #define MS_INVALIDATE	2		/* Invalidate the caches.  */
74 
75 /* Flags for `mlockall'.  */
76 #define MCL_CURRENT	1		/* Lock all currently mapped pages.  */
77 #define MCL_FUTURE	2		/* Lock all additions to address
78 					   space.  */
79 
80 /* Flags for `mremap'.  */
81 #ifdef __USE_GNU
82 # define MREMAP_MAYMOVE	1
83 # define MREMAP_FIXED	2
84 #endif
85 
86 /* Advice to `madvise'.  */
87 #ifdef __USE_BSD
88 # define MADV_NORMAL	  0	/* No further special treatment.  */
89 # define MADV_RANDOM	  1	/* Expect random page references.  */
90 # define MADV_SEQUENTIAL  2	/* Expect sequential page references.  */
91 # define MADV_WILLNEED	  3	/* Will need these pages.  */
92 # define MADV_DONTNEED	  4	/* Don't need these pages.  */
93 # define MADV_FREE	  8	/* Free pages only if memory pressure.  */
94 # define MADV_REMOVE	  9	/* Remove these pages and resources.  */
95 # define MADV_DONTFORK	  10	/* Do not inherit across fork.  */
96 # define MADV_DOFORK	  11	/* Do inherit across fork.  */
97 # define MADV_MERGEABLE	  12	/* KSM may merge identical pages.  */
98 # define MADV_UNMERGEABLE 13	/* KSM may not merge identical pages.  */
99 # define MADV_HUGEPAGE	  14	/* Worth backing with hugepages.  */
100 # define MADV_NOHUGEPAGE  15	/* Not worth backing with hugepages.  */
101 # define MADV_DONTDUMP	  16    /* Explicity exclude from the core dump,
102                                    overrides the coredump filter bits.  */
103 # define MADV_DODUMP	  17	/* Clear the MADV_DONTDUMP flag.  */
104 # define MADV_WIPEONFORK  18	/* Zero memory on fork, child only.  */
105 # define MADV_KEEPONFORK  19	/* Undo MADV_WIPEONFORK.  */
106 # define MADV_COLD        20	/* Deactivate these pages.  */
107 # define MADV_PAGEOUT     21	/* Reclaim these pages.  */
108 # define MADV_POPULATE_READ 22	/* Populate (prefault) page tables
109 				   readable.  */
110 # define MADV_POPULATE_WRITE 23	/* Populate (prefault) page tables
111 				   writable.  */
112 # define MADV_DONTNEED_LOCKED 24 /* Like MADV_DONTNEED, but drop
113 				    locked pages too.  */
114 # define MADV_COLLAPSE    25	/* Synchronous hugepage collapse.  */
115 # define MADV_HWPOISON	  100	/* Poison a page for testing.  */
116 #endif
117 
118 /* The POSIX people had to invent similar names for the same things.  */
119 #ifdef __USE_XOPEN2K
120 # define POSIX_MADV_NORMAL	0 /* No further special treatment.  */
121 # define POSIX_MADV_RANDOM	1 /* Expect random page references.  */
122 # define POSIX_MADV_SEQUENTIAL	2 /* Expect sequential page references.  */
123 # define POSIX_MADV_WILLNEED	3 /* Will need these pages.  */
124 # define POSIX_MADV_DONTNEED	4 /* Don't need these pages.  */
125 #endif
126 
127 #define MFD_CLOEXEC 1U
128 #define MFD_ALLOW_SEALING 2U
129 #define MFD_HUGETLB 4U
130